Games like Eternal Decay Souls
Games like Eternal Decay Souls include Chained Together, Yooka-Replaylee, Supraland, Portal 2, and Solar Ash. We matched them by the tags players give Eternal Decay Souls on Steam (Exploration, Choose Your Own Adventure, Hack and Slash, 3D Platformer, and Puzzle Platformer): closest matches first, and among equally close ones the better-known games.

Chained Together
Shared: Puzzle Platformer · 3D Platformer · Platformer

Yooka-Replaylee
Shared: Exploration · 3D Platformer · Collectathon

Supraland
Shared: Exploration · Puzzle Platformer · 3D Platformer

Portal 2
Shared: Puzzle Platformer · Puzzle · Platformer

Solar Ash
Shared: 3D Platformer · Exploration · Hack and Slash

Sonic Frontiers
Shared: 3D Platformer · Exploration · Adventure

A Hat in Time
Shared: 3D Platformer · Collectathon · Exploration

ANIMAL WELL
Shared: Exploration · Puzzle Platformer · Puzzle

Avorion
Shared: Exploration · Sandbox · Choose Your Own Adventure

Hob
Shared: Exploration · Puzzle · Puzzle Platformer

Squirrel with a Gun
Shared: Sandbox · 3D Platformer · Exploration

FEZ
Shared: Exploration · Puzzle · Platformer

Portal
Shared: Puzzle Platformer · 3D Platformer · Puzzle

Tomb Raider IV-VI Remastered
Shared: Exploration · 3D Platformer · Puzzle

鬼谷八荒 Tale of Immortal
Shared: Choose Your Own Adventure · Sandbox · Exploration

Yooka-Laylee
Shared: 3D Platformer · Collectathon · Exploration

Human Fall Flat
Shared: Puzzle · Puzzle Platformer · Sandbox

Pumpkin Jack
Shared: 3D Platformer · Collectathon · Adventure

COCOON
Shared: Exploration · Puzzle Platformer · Puzzle

Trine 3: The Artifacts of Power
Shared: Puzzle Platformer · 3D Platformer · Puzzle

Crimson Desert Enhanced
Shared: Exploration · Choose Your Own Adventure · Action

Duskfade
Shared: Exploration · 3D Platformer · Hack and Slash

STAR WARS Jedi: Fallen Order™
Shared: Exploration · Action-Adventure · Platformer

Disney Epic Mickey: Rebrushed
Shared: 3D Platformer · Choose Your Own Adventure · Exploration